In this photo released by Warner Bros, performer Justin Bieber poses with Principal Sherrie Gahn of Whitney Elementary School in Las Vegas, Nev. on Friday, Dec. 16, 2011. Justin presented a check for $100,000 to Principal Sherrie Gahn of Whitney Elementary School and performed a holiday concert for the students. This segment will air on "The Ellen DeGeneres Show" on Wednesday, Jan. 4. (AP Photo/Warner Bros., Michael Rozman)